Exterminators get rid of termites by creating a barrier between the termites and their food which in this case is your shed. They pump poison into the ground around foundation to create a barrier. If you have posts in the ground they will come up through the posts, can't spray the middle of the posts. Contrary to popular opinion they eat treated wood after about 10 years. If the termites have to use mud tubes to get to the wood they'll be easy to control. Otherwise you better call someone if you value your buildings.

Jeff, not sure what your intent is, I will try to read between the lines.

Any contact spray insecticide will work if you are spraying swarming termites. Talstar.(*Cannot be sold to : MA, NY, CT, SC,VT, HI, AK)
or Permethrin.(*Not for sale in NY. ,CT. SC., VT.)

If you are treating around the foundation (underground) Termidor or Phantom. It is also resticted for sale in certain states via internet but may be available locally. These are residual and will act as a berrier and as termites migrate through they absorb it through contact.

Another way if you do not have termites but want to protect against them is to use bait monitors. They must be inspected every couple months and if they do show signs, you then replace with a poison.(available at home improvement stores)

I have been in the pest elimination business for twenty five years and in fact one of my techs who has been with me for 20yrs. was recently voted one of the top four Termite techs in the country.Call me and I will help you.Dennis @781-910-0313.or email@DennisMastrolia@verizon.net

Try contacting www.doyourownpestcontrol.com (seriously) they have info and chemicals and whatevers you need to fight the bugs.
I had an infestation of carpenter bees in my house, and their stuff did the trick.